212405733 has 10 divisors (see below), whose sum is σ = 317297574. Its totient is φ = 141603768.

The previous prime is 212405671. The next prime is 212405747. The reversal of 212405733 is 337504212.

212405733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 187635204 + 24770529 = 13698^2 + 4977^2 .

It is not a de Polignac number, because 212405733 - 2¹⁴ = 212389349 is a prime.

It is a super-2 number, since 2×212405733² = 90232390822534578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 212405697 and 212405706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212405783) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1311066 + ... + 1311227.

Almost surely, 2^212405733 is an apocalyptic number.

It is an amenable number.

212405733 is a deficient number, since it is larger than the sum of its proper divisors (104891841).

212405733 is an equidigital number, since it uses as much as digits as its factorization.

212405733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622305 (or 2622296 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 212405733 is about 14574.1460470245. The cubic root of 212405733 is about 596.6533428496.

Adding to 212405733 its reverse (337504212), we get a palindrome (549909945).

The spelling of 212405733 in words is "two hundred twelve million, four hundred five thousand, seven hundred thirty-three".